Electric relay.



C. P. G. JOUBART.

ELECTRIC RELAY.

APPLICATION FILED JUNE 4, 1914.

Patented May 30,1916.

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c. P. a. JOUBART.

ELECTRIC RELAY.

APPLICATION FILED JUNE 4,1914.

1 ,1 85,332, Patented May 30, 1916.

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UNITE STATES PATENT OEFTQE.

CHARLES PAUL GEORGES JOUBART, OF ST.DENIS, FRANCE, ASSIGNOR TO SOCIETE DELECTRICITE DE PAR-IS, OF PARIS, FRANCE, A LIMITED JOINT-STOCK COMPANY.

ELECTRIC RELAY.

Specification of Letters Patent.

Patented May 30, 1916.

Application filed June 4, 1914. Serial No. 842,846.

To all whom it may concern Be it known that 1, CHARLES PAUL GEORGES JOUBART, citizen of the Republic of France, residing at St.-Denis, Seine,France, have invented certain new and useful Improvements in ElectricRelays, of which the following is a specification.

The electric time relays at present in use for causing the operation orrelease of any apparatus, in cases where the value of the currentpassing in a conductor or an electric machine exceeds a predeterminedlimit, operate with a rapidity which is greater the greater theoverload. If a plurallty of such relays located in series on the samecircuit, are adjusted to produce, in a case of overloading, the breakingof the said circuit at different times at different intervals apart, ithas been observed that when the overload exceeds a certain amount, thetimes of the operation or release vary very little as a function of theoverload and have a tendency to coincide on the occurrence of a suddentshort-circuit. In such circumstances it is impossible to rely upon aselective action of such relays. When however, automatic cut-outs arelocated in series along a conductor, it is extremely 1mportant thatthese devices shall be able to operate in a selective manner,irrespectively of the value of the current, that is to say, that for anyvalue of the current the several releases shall always take place atdifferent predetermined times in a strictly determined order. It isequally important that the tunes taken by the releases shall be longerthe weaker the overloads; that is to say, in the case of cut-outsarranged in series these de-, vices shall open less quickly in the caseof a small overload than in the case of a great overload or of ashort-circuit.

Now this invention has for its object to provide an improved relay,which is dif ferentiated from the ordinary relays by the circumstancethat it affords the above stated advantages.

One form of a relay constructed according to this'invention isillustrated by way of example in the accompanying drawings, in which:

Figure 1 is a side view thereof, Fig. 2 is a cross section on the line wz of Fig. 1;

and Fig. 3 shows a detail part.

As shown, the improved relay comprises a disk A mounted loose on a shaft0. The disk A may be rotated on its axis by any suitable electric meanswhich can produce therein a drlying couple generated by the currentflowing in the winding of the relay (rotat ng field, reaction of a coilshort-circuited 1n the field, electromagnetic action, etc.) To the diskA there is fixed a finger J connected to the shaft 0 by means of aspiral spring R, which is attached at one end to the said finger J andat its other end to a sleeve 1' fixed on the shaft 0.

When the disk A is caused by the aforesaid driving couple to rotate inthe direction of the arrow f (Fig. 1), the said disk will drive theshaft 0 through the medium of the spring B. This spring is normallystressed in such a manner that it will always move the finger J backinto contact with a tappet P that is fixed on the sleeve 1'.

The shaft 0 has also fixed on it a toothed wheel E engaging a pinion Bfixed on a shaft M that carries a fly governor C. The toothed wheel Ehas a finger S which is caused by the rotation of the shaft 0, to bearupon the movable member of a contact device F D for effecting theclosure of an auxiliary electric circuit actuating the apparatuscontrolled by the relay.

The hub of the disk A is constructed as a drum N on which is adapted tobe wound a flexible wire or chain Z carrying a weight K. When the diskis rotated as above stated in the direction of the arrow 7, the wire Zwill be wound on the drum N and will thus lift the weight K. If now thedisk A be released, the weight K will act to rotate the disk A backwarduntil a stop T fixed to the said disk comes against an external fixedpoint, for instance the part U, which corresponds to the position ofrest of the relay.

The operation of the improved relay is as follows z-lVhen by the actionof a driving couple generated by the current flowing in the winding ofthe relay, the disk A begins to rotate in the direction of the arrow f,it winds the wire Z upon the drum N, and at the same time it drives theshaft 0 through the medium of the spring R, and with it, the toothedwheel E, the pinion B and the governor C. If the driving force of, thedisk A is smaller than the resisting couple produced by the governor Cand the spring R, the members J and P will remain in con tact with eachother, and the speed of rotation of the toothed wheel E will be afunction of the driving couple of the disk A. The same relation holdsgood for the time taken by the finger S to actuate the contact device FD of the auxiliary circuit. As soon as this contact takes place it willbring about the operation or the release of the apparatus controlled bythe relay. In a case where the overload occurring in the circuit of therelay disappears before the finger S has played the part allotted to it,it is to be understood that the various movable members hereinbeforereferred to, will resume their positions of rest under the action of theweight K, since the motion of the disk A in the opposite direction tothat of the arrow f is transmitted to the shaft 0 and thence to thepinion B by the finger J that is in engagement with the tappet I It isto be noted that by varying the weight K, it is possible to vary thevalue of the driving couple at which the disk A begins to be set inmotion.

If when the disk A is rotating in the direction of the arrow f, thedriving force of this disk is greater than the resisting couple producedby the governor C and the spring R, the latter will be stressed and thefinger J will leave the tappet P. In such a case the disk A will stilldrive the shaft 0 by means of the spring R, and consequently the toothedwheel E, the pinion B and the governor C, but then the time taken by thefinger S before it begins to actuate the contact device F D of theauxiliary circuit will. depend on the resistance offered by the governorC. This time is increased and consequently the closure of the auxiliarycircuit is retarded, contrary to what is the case with the relays atpresent in use. In this latter case as in the former case above referredto, as soon as the overload in the circuit of the Winding of the relayceases, whether the finger S has or has not effected the closure of theauxiliary circuit F D, the various movable elements or members will becaused by the action of the weight K to resume automatically theirposition of rest, the finger J of the disk A being brought again intoengagement with the tappet P fixed to the shaft 0.

With a relay constructed according to the foregoing conditions, and bysuitably selecting the weight K, and adjusting the value of theresistance couple produced by the governor C, which may be readilyeffected by changing the position or angle of the vanes of the saidgovernor, it will be possible to give to the time of release a strictlydetermined value.

Instead of acting simply upon the vanes of the governor C in order toeffect the adjustment just mentioned, that is to say for varying thetime taken by the finger S for closing-the contact device F I) of theauxiliary circuit, it is also possible to act upon the tension of thespring R.

If a plurality of these relays included in series in one and the samecircuit are adjusted for varying times of release, a certain selectiveaction taking place in the determined order will be produced.

It is to be understood that the Iiy governor C hereinbefore referred tois described and shown simply by way of example and that any otherdevice giving the same result, that is to say capable of producing aretarding couple, may be employed without departing from the nature ofthe present invention. For instance, for this purpose there may beemployed either a disk rotating in a magnetic field or forces due togravity, friction, &c. Likewise the weight K may be replaced by astressed spiral spring fixed at one end and acting at its other end uponthe disk K.

Instead of the drum N on which the cord Z is wound, there may beemployed a sort of spiral cam for receiving the said cord 1 so as tovary automatically the effect produced by the weight K.

What I claim is:

1. An electric time relay comprising, in combination with arelaywinding, 2. rotary member, means for rotating the same by currentflowing in the said relay Wind ing, a rotary shaft carrying said rotarymember, a yielding means between said shaft and said rotary member totransmit rotation from said rotary member to said shaft, a second rotaryshaft geared with the said first rotary shaft, adjustable means on thesaid second rotary shaft to resist the rotation of the said rotarymember, a contact device, means connected with the said first rotaryshaft to close the said contact device, and means for returning all themovable parts to their initial positions.

2. An electric time relay comprising, in combination with a relaywinding, a rotary member, means for rotating the same by a currentflowing in the said relay Winding, a

rotary shaft carrying said rotary member, a

yielding means between said shaft and said rotary member to transmitrotation from the latter to the former, a second rotary shaft, a gearingcoupling said second rotary shaft with the said first rotary shaft, 3,contact device, a projection on the gear mounted on the said firstrotary shaft adapted to close the said contact device, an adjustablemeans on the said second rotary shaft to resist the rotation of the saidrotary member in conjunction with the said yielding means,means forreturning all the movable parts to their initial positions, and a stopon said first rotary shaft to hold the said rotary member at rest.

3. An electric time relay comprising, in

combination with a relay Winding, a rotary shaft adapted to resist therotation of said disk, means for rotating the same by currotary disk inconjunction with said spiral rent flowing in the said relay winding, aspring, and means connected with the hub rotary shaft carrying the saidrotary disk, of said rotary disk to return all the movable B a spiralspring fast on said rotary shaft, a parts to their original positions.

pin in said rotary disk engaging said spiral In testimony whereof I haveafiixed my spring, a tappet ojn said drotary shaft formsignature inpresence of two Witnesses. ,ing an abutment or sai pin, a second ro- Htary shaft geared with said first rotary shaft, CHARLES PAUL GEORGESJOUBAR 10 a contact device, means connected with said Witnesses:

first rotary shaft to close said contact de- LOUIS FAUTRAT, ice,adjustable vanes on said second rotary CHAS. P. PRESSLY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0."

